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General E46 Forum
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Old 06-26-2008, 03:40 PM   #1
oceanfront26
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E46 Fuel Pump

I'm new to this forum, I just got this E46 and this is the first time trying to fix it myself, I would like to know if any of you guys have had trouble with the fuel Pump, If so I would like to know how to know if is broken? Thank you.

The car cranks but won't start and the i let it seat for about 4hr and it will start again, I need help trying to Diagnos it.

Last edited by oceanfront26; 06-26-2008 at 04:22 PM.
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Old 06-26-2008, 05:05 PM   #2
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well if it starts up after 4 hours then the pump is somewhat working. Most likely it's something else. It could be anything; relay, crank sensors, etc...

Check if it throwing any CEL code, go from there.
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Old 06-26-2008, 08:07 PM   #3
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Quote:
Originally Posted by oceanfront26 View Post
I'm new to this forum, I just got this E46 and this is the first time trying to fix it myself, I would like to know if any of you guys have had trouble with the fuel Pump, If so I would like to know how to know if is broken? Thank you.

The car cranks but won't start and the i let it seat for about 4hr and it will start again, I need help trying to Diagnos it.
pump problems most like fail under load not at start up ,if pump was bad it woul not start ever . run a scan you might have a problem somewere else .
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Old 06-26-2008, 08:23 PM   #4
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never seen a pump problem on an e46 and i been workin on 'em a year
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Old 06-26-2008, 08:27 PM   #5
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My pump just went out a few weeks ago. Car ran like a champ one day, next day it wouldnt start. Changed it in about 15 minutes, and did the filter also. Fired right up.
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Old 06-26-2008, 10:56 PM   #6
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It could be your fuel filter only being clogged. Happened to me also...Was in traffic and the car just shut off. Tried to start it but the car would not stay on, or would not let me rev it...and cut out after a few seconds. When they towed the car to the dealership a few hours later, it started just fine.

Basically, from what was explained to me...because the fuel filter is clogged, it could not pass fuel to the side of the tank where the pump is...

Fuel filter replacement is done on each inspection I, I think, or II. haha
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Old 06-26-2008, 11:31 PM   #7
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I had My car scan today and they are No codes on it. but I still have the problem I will start by changing the fuel filter and i will take it from there i will keep you guys post it thank you for all the good replies keep them comming.
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Old 06-27-2008, 12:01 AM   #8
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I had my fuel pump die on me while on the highway. Had merge over 3 lanes of traffic to get to the shoulder with no power.

Sure way to test is to look at your fuel rail. There's a small valve towards the front, if you press it with a small tipped screwdriver, fuel should come out. In my case, I heard AIR.

I'll have to agree with checking your fuel filter (under the belly, driver's side). Go ahead and check your fuel lines (especially going towards the front of the vehicle). Any kinks is sure to restrict fuel flow.
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Old 06-27-2008, 12:43 AM   #9
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Just replaced the fuel pump on my daughter's car 2 months ago. Problem was intermittent, it stalls and not start. After a few hours, it will start again. One way to check if the fuel pump is the culprit is to listen for the sound. When you turn the key on (without starting engine), you should hear the pump run for a few seconds. If you can't hear any sound, more than likely the pump is broke. Another test is to lift the rear seat to gain access to the pump (passenger side). Tap the fuel pump with a rubber mallet then try starting the car. If it starts, then 100% you need a new fuel pump. Good luck!
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Old 06-27-2008, 07:33 AM   #10
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Originally Posted by oceanfront26 View Post
I had My car scan today and they are No codes on it. but I still have the problem I will start by changing the fuel filter and i will take it from there i will keep you guys post it thank you for all the good replies keep them comming.
fuel related problems will not set any faults in the DME on the e46 . i would check fuel pressure at iddle , and then while driving ( under load ) . If you do have a pump problem you should replace the filter as well .
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Last edited by scarface007; 06-27-2008 at 07:38 AM.
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Old 06-27-2008, 07:38 AM   #11
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Just replaced the fuel pump on my daughter's car 2 months ago. Problem was intermittent, it stalls and not start. After a few hours, it will start again. One way to check if the fuel pump is the culprit is to listen for the sound. When you turn the key on (without starting engine), you should hear the pump run for a few seconds. If you can't hear any sound, more than likely the pump is broke. Another test is to lift the rear seat to gain access to the pump (passenger side). Tap the fuel pump with a rubber mallet then try starting the car. If it starts, then 100% you need a new fuel pump. Good luck!
i dont know were you learned your diag techniques but these aint our fathers 69 Camaro . The fuel system is more complex than that . for example If you have a siphen pump problem ( wich is the left side sending unit that feeds fuel to the right ) you can have these problems listed above , fuel pump could be good but starving it self becasue of a faulty siphen pump . dont just throw parts at the car unless its an ovious problem , dignose the problem right and fix it first the first time .
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Old 06-27-2008, 08:26 PM   #12
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i dont know were you learned your diag techniques but these aint our fathers 69 Camaro . The fuel system is more complex than that . for example If you have a siphen pump problem ( wich is the left side sending unit that feeds fuel to the right ) you can have these problems listed above , fuel pump could be good but starving it self becasue of a faulty siphen pump . dont just throw parts at the car unless its an ovious problem , dignose the problem right and fix it first the first time .
I'm just providing information that I have experienced and fixed my problem. If you have a full tank of gas and still have the problem, I think you can rule out the siphon pump being the culprit.
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Old 06-28-2008, 04:18 PM   #13
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Just a keep update, Today I change the fuel filter and the fuel relay before changing the fuel pump, i will run it see if that takes care of the problem.
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Old 07-02-2008, 05:42 PM   #14
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Is been about a week since a change the fuel filter and the car runs very smooth just like a bimmer should, I think that was the problem thank you guys.
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Old 08-20-2008, 11:01 PM   #15
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Well my problem came back and now i'm thinking of replacing the fuel pump.
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Old 08-21-2008, 02:16 AM   #16
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well there was another thread recently showing how to test the fuel pump. i'd do that first.

http://forum.e46fanatics.com/showthr...+baffle&page=2
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Old 08-21-2008, 02:21 AM   #17
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I believe you can put in a M3 e46 fuel pump for alittle upgrade...

Read it somewhere.. forgot.
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Old 08-21-2008, 08:30 AM   #18
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I had my fuel pump go out. Took 15 minutes to replace it. It's really, really easy. Just bring a bunch of shop rags because you're probably going to get gas on yourself.
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Old 08-21-2008, 09:55 AM   #19
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take off the plastic cover beside the valve cover that covers the injectors, and on the fuel line you will see a valve, inside it is a schrader valve like on tires. u can remove that schrader valve, put a hose on it going into a bottle or something and turn the key on and see if you have any fuel pressure
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Old 09-08-2008, 12:51 PM   #20
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I finally Change the fuel pump I spent about $150.00 and 30min of labor DIY and i got it pump from http://www.bmaparts.com/ grade deal Thank you.
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